Add: partner support to metadata parsing

[lwasser]

closes #92

This is a small fix to parse the partners in our issues and then return the value in our model.
NOTE: need to test the full workflow including exporting to yaml before merging this so i'll open as a draft. i suspect i have to add a key somewhere to reorder the data.

Also note that this pr inspired #91 because the code to parse the header is super hard to follow.

[lwasser]

This is working now BUT the categories are doing something funky --

    - data-retrieval
    - data-extraction
    - data-processing/munging
    - data-deposition
    - data-validation and-testing
    - workflow-automation
    - database-interoperability

will revisit that piece and potential pydantic validators to cleanup.